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Old Jun 13, 2005, 12:27 PM
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Mini 3D EPP for CD brushless: Part 3

Continued from part 2:
http://www.rcgroups.com/forums/showt...34#post3884275

Xoon,
With those heavy components it will work but be so heavy it will hardly fly like a Slofly plane is intended to.
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Old Jun 13, 2005, 12:42 PM
don't think.. just fly!!!
Littleton, Colorado
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but my question is does it include CF RODs? or just precut foam? i need to know this because i'm gonna order pretty soon


i found the answer.


how long of a flight do i get if i use a 1800 mah battery? how about 700 mah?
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Last edited by xoon; Jun 13, 2005 at 12:49 PM.
Old Jun 13, 2005, 01:31 PM
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Old Jun 13, 2005, 02:17 PM
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... epp ...
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Old Jun 13, 2005, 02:29 PM
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Micro 3d update:
It works great!
The lps-b plastic motor gear lasted me 2 days on it.
After nose impacts the shaft can slide and when given power the shaft goes foward and the motor strips the back half of the gears.
If it was CA'd to stop sliding it would have lasted a lot longer.

The plane is fun with the LPS-B!!! Just enough thrust to go straight up.
It is like driving a car in first gear. It powers thorugh wind chops but top speed is low.
Video will be made for it.

So the tape came off to remove the lps-b and the 15T Lens motor was taped on.
It shoots straight up like some higher amp draw setups and with the big boy 9in chord it floats down slowly. This plane is working good for the first version- elevator too small, too short of fuse spar. I'm working on the CNC files for the elevator slot and elevator.

We have made a flat wing with EPP spar - no carbon
Not only does it act as a spar but at speed it prevents the flat airfoil pitch problem between pos and neg angle of attack!
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Old Jun 13, 2005, 02:36 PM
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gone fishing
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Old Jun 13, 2005, 04:22 PM
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I agree, I think this needs to be exploited! I tried 2 pieces of 1-1/2" wide depron on my mini 3D BluCub (that's a blast BTW, although not as easy to fly as a mid-wing), and I think it helped, but could use more thickness. I almost tried it on my 4F-51, but chickened out. Maybe I'll do it on the next 4F-????? warbird I draw...

Probably a % thickness? Maybe 4% or more like 10%???
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Old Jun 13, 2005, 05:02 PM
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The epp spar is being used on the 22"

Imagine the earth curving under telephone poles- the lines would serve to hold the poles from spreading a part.
If under the surface you had telephone poles going down with lines it would help stop curving the other way.
The taller the poles the more the line is stretched for the same curve- hense more tensile resistance to flex.
Instead of telephone poles we use foam which also has some compression resistance.
The strength comes from the strip of strapping tape across the top. This acts is a line which resists stretching with a lot of strength.
A flat strip of carbon will do the same and add compression resistance for more strength but I find simply gluing a CF tube to the wing easier than that.
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Old Jun 13, 2005, 06:15 PM
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Hey Gene what size pieces did you get when you made the 4F-51? The Small box or Big Box of EPP that Steve sells
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Old Jun 13, 2005, 07:22 PM
don't think.. just fly!!!
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can i use this motor instead of the one that you have posted sloper steve? http://www.hobby-lobby.com/brushless-skatty.htm the 400XT motor, good for 3D a plane around 9 oz.
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Old Jun 13, 2005, 08:00 PM
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bass: it was the *only* box, at the time
Hang on.... 12x34" sheets... All you need is 12x24x2 & ~12x12 (actually, for the 4F-Zero, I used BluCor FanFold, and cheated to 23.5" to fit the width
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Old Jun 13, 2005, 08:19 PM
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Thanks Gene, it will be on the list to build. I just ordered one of Steves mini3D 30"
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Old Jun 13, 2005, 09:31 PM
Dave North
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xoon:

That motor would be fine except it's heavy: 1.5 ounces is great on most planes but starting to "heft up" for these guys. On the other hand, it's awfully cheap on sale.

The plane would fly; in fact on 3s you could probably rip its wings off. But it's not likely to be very "floaty."

Ten amp max 3s is around 100 watts real world, which is insane on these planes. Insane, however, is what we're all about, no? Your call!


Dave North
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Old Jun 16, 2005, 05:59 PM
clever phrase here
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Atlanta, GA
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steve,

on your site i see that you offer the dubro control horns for the mini-3d's. do these control horns work well on your big 32" ships as well?

i've used them on the little 26" mini-3d, but am a little concerned about how much grip they will provide for the big ailerons on the 32".

thanks.

-james
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Old Jun 16, 2005, 07:53 PM
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Hi FC,

They work great with the 'plywood horn mounts'
The plywood distributes the torque from the horn over a larger foam area and out farther from the hinge too.

On a smaller test plane I just epoxied the horn to the epp and spread some epoxy out farther. After seeing the flexibilty of the epoxy I'm sticking to the plywood. The 1/64 plywood works great.
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